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Passage Based/ SA-I SA-II LA S QUESTION PAPER DESIGN 2020-21# Passage based/ SA-I SA-II LA S. No. Chapter Total MCQs/A & R (1 mark) (2 marks) (3 marks) (5 marks) 1. The Solid State 1(1) 1(2) 1(3) – 2. Solutions 2(2) 1(2) – – 3. Electrochemistry 1(1) – – 1(5) 11(24) 4. Chemical Kinetics – 2(4) – – 5. Surface Chemistry 1(4) – – – 6. The p-Block Elements 1(1) 1(2) 1(3) 1(5) 7. The d- and f-Block Elements 2(2) – 1(3) – 9(19) 8. Coordination Compounds 1(1) 1(2) – – 9. Haloalkanes and Haloarenes 1(1) 2(4) – – 10. Alcohols, Phenols and Ethers 2(5) 1(2) – – 11. Aldehydes, Ketones and Carboxylic Acids 1(1) – – 1(5) 13(27) 12. Amines 1(1) – 1(3) – 13. Biomolecules 2(2) – 1(3) – Total 16(22) 9(18) 5(15) 3(15) 33(70) 1. The Solid State ............................................................................................................................................1 2. Solutions ���������������������������������������������������������������������������������������������������������������������������������������������������12 3. Electrochemistry .......................................................................................................................................25 4. Chemical Kinetics .....................................................................................................................................35 5. Surface Chemistry �������������������������������������������������������������������������������������������������������������������������������������48 6. General Principles and Processes of Isolation of Elements 7. The p-Block Elements ...............................................................................................................................56 8. The d- and f-Block Elements .....................................................................................................................65 9. Coordination Compounds �������������������������������������������������������������������������������������������������������������������������72 10. Haloalkanes and Haloarenes ....................................................................................................................84 11. Alcohols, Phenols and Ethers ....................................................................................................................98 12. Aldehydes, Ketones and Carboxylic Acids ...............................................................................................111 13. Amines ...................................................................................................................................................126 14. Biomolecules ..........................................................................................................................................137 15. Polymers 16. Chemistry in Everyday Life This chapter is not a part of the Board Examination 2020-21 syllabus #For latest information please refer to www.cbse.nic.in CHAPTER Aldehydes, Ketones 12 and Carboxylic Acids CASE STUDY / PASSAGE BASED QUESTIONS 1 Read the passage given below and answer the following questions : The addition reaction of enol or enolate to the carbonyl functional group of aldehyde or ketone is known as aldol addition. The b-hydroxyaldehyde or b-hydroxyketone so obtained undergo dehydration in second step to produce a conjugated enone. The first part of reaction is an addition reaction and the second part is an elimination reaction. Syllabus Carbonyl compound having a-hydrogen undergoes aldol condensation reaction. O O Aldehydes and – Ketones : Nomen- OH 2CH3CH2 C H D CH3CH2CH CC H clature, nature of carbonyl group, CH3 methods of prepa- Mechanism : ration, physical O O and chemical HO + HCCH H 3C CHH C H properties, mecha- –H2O nism of nucleo- CH3 philic addition, O O O O reactivity of alpha hydrogen in alde- CH3CH2 C +CH C H CH3CH2 CH CH C H hydes, uses. H CH CH Carboxylic Acids : 3 3 Nomenclature, OH O O acidic nature, H2O –H2O – CH CH CH CH C H CH CH CH CC H methods of prepa- –OH 3 2 D 3 2 CH ration, physical CH3 3 and chemical The following questions are multiple choice questions. Choose the most appropriate properties, uses. answer : (i) Condensation reaction is the reverse of which of the following reaction? (a) Lock and key hypothesis (b) Oxidation (c) Hydrolysis (d) Glycogen formation (ii) Which of the following compounds would be the main product of an aldol condensation of acetaldehyde and acetone? (a) CH3CH CHCHO (b) CH3CH CHCOCH3 (c) (CH3)2C CHCHO (d) (CH3)2C CHCOCH3 112 Chemistry | Class 12 (iii) Which combination of carbonyl compounds gives phenyl vinyl ketone by an aldol condensation? O Ph (a) Acetophenone and Formaldehyde (b) Acetophenone and acetaldehyde (c) Benzaldehyde and acetaldehyde (d) Benzaldehyde and acetone (iv) Which of the following will undergo aldol condensation? (a) HCHO (b) CH3CH2OH (c) C6H5CHO (d) CH3CH2CHO OR Which of the following does not undergo aldol condensation ? (a) CH3CHO (b) CH3CH2CHO (c) CH3COCH3 (d) C6H5CHO 2 Read the passage given below and answer the following questions : When an aldehyde with no a-hydrogen reacts with concentrated aqueous NaOH, half the aldehyde is converted to carboxylic acid salt and other half is converted to an alcohol. In other words, half of the reactant is oxidized and other half is reduced. This reaction is known as Cannizzaro reaction. O O Conc. NaOH 2 C H C ONa + CH2OH Mechanism : O O O Ph C H OH Ph CCH + Ph OH H O O O OH Ph C + H C PhPh C + H C Ph O H O H H The following questions are multiple choice questions. Choose the most appropriate answer : (i) A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives (a) benzyl alcohol and sodium formate (b) sodium benzoate and methyl alcohol (c) sodium benzoate and sodium formate (d) benzyl alcohol and methyl alcohol. (ii) Which of the following compounds will undergo Cannizzaro reaction? (a) CH3CHO (b) CH3COCH3 (c) C6H5CHO (d) C6H5CH2CHO (iii) Trichloroacetaldehyde is subjected to Cannizzaro’s reaction by using NaOH. The mixture of the products contains sodium trichloroacetate ion and another compound. The other compounds is (a) 2, 2, 2-trichloroethanol (b) trichloromethanol (c) 2, 2, 2-trichloropropanol (d) chloroform. OR In Cannizzaro reaction given below : – OH – 2PhCHO PhCH2OH + PhCO2 the slowest step is Aldehydes, Ketones and Carboxylic Acids 113 (a) the attack –OH at the carboxyl group (b) the transfer of hydride to the carbonyl group (c) the abstraction of proton from the carboxylic group (d) the deprotonation of PhCH2OH. (iv) Which of the following reaction will not result in the formation of carbon-carbon bonds? (a) Cannizzaro reaction (b) Wurtz reaction (c) Reimer-Tiemann reaction (d) Friedel-Crafts’ acylation 3 Read the passage given below and answer the following questions : A tertiary alcohol H upon acid catalysed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M. O H3C Ph M = Ph H The following questions are multiple choice questions. Choose the most appropriate answer : (i) Compound H is formed by the reaction of O O + PhMgBr + PhCH2MgBr (a) Ph H (b) Ph CH3 O O Me + + PhCH2MgBr (c) Ph H (d) Ph H Ph MgBr OR The structure of compound I is Ph CH Ph Ph CH HC CH 3 HC3 3 3 3 (a) (b) (c) (d) H Ph H Ph H CH2Ph Ph H (ii) The structures of compound J, K and L, respectively, are – + – + (a) PhCOCH3, PhCH2COCH3 and PhCH2COO K (b) PhCHO, PhCH2CHO and PhCOO K – + – + (c) PhCOCH3, PhCH2CHO and CH3COO K (d) PhCHO, PhCOCH3 and PhCOO K (iii) When (J) is treated with acetic anhydride, in the presence of corresponding salt of an acid, the product obtained is (a) cinnamic acid (b) crotonic acid (c) maleic acid (d) benzylic acid. (iv) Which of the following statements is correct for compound (K)? (a) It reacts with alkaline KMnO4 followed by acidic hydrolysis and forms benzoic acid. (b) It reacts with iodine and NaOH to form triiodomethane. (c) It is prepared by the reaction of benzene with benzoyl chloride in presence of anhydrous aluminium chloride. (d) It reacts with freshly prepared ammoniacal silver nitrate solution. 114 Chemistry | Class 12 4 Read the passage given below and answer the following questions : Carboxylic acids dissociate in water to give carboxylate ion and hydronium ion. – + RCOOH + H2O RCOO +H3O The acidity of carboxyl group is due to the presence of positive charge on oxygen which liberates proton. The carboxylate ion formed is resonance stabilised. O – O – O O–1/2 e.g., C R C H2O O + R C R C R C R O O H O H –H3O – + O O–1/2 Carboxylic acids are stronger acids than phenols. Electron withdrawing groups (EWG) increase the acidity of carboxylic acids by stabilising the conjugate base through delocalisation of negative charge by inductive and/or resonance effects. Electron donating group (EDG) decrease the acidity by destabilising the conjugate base. The following questions are multiple choice questions. Choose the most appropriate answer : (i) Which of the following reactions is showing the acidic property of carboxylic acid? O O O O (a) 2CR OH + 2Na 2CR ONa + H2­ (b) R C OH + NaOH R C ONa + HO2 ­ O O (c) 2CR OH + 2NaC23O 2CR ONa (d) All of these. + HO22 + CO ­ (ii) Which one of the following is the correct order of acidic strength? (a) CF3COOH > CHCl2COOH > HCOOH > C6H5CH2COOH > CH3COOH (b) CH3COOH > HCOOH > CF3COOH > CHCl2COOH > C6H5CH2COOH (c) HCOOH > C6H5CH2COOH > CF3COOH > CHCl2COOH > CH3COOH (d) CF3COOH > CH3COOH > HCOOH > CHCl2COOH > C6H5CH2COOH OR The acidic strength of the given
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